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Alloy coating, processing method thereof and antiseptic spherical tank

A technology of alloy coating and metal coating, which is applied in the field of anti-corrosion spherical tanks, can solve the problems that the safety lower limit cannot be completely determined, and achieve the effects of prolonging the safe use period and inspection period, good corrosion resistance and good combination

Inactive Publication Date: 2011-04-13
北京赛诺迪管道安全技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of corrosion investigations have shown that the safe lower limit of hydrogen sulfide content to prevent stress corrosion cracking cannot be fully determined; foreign sources have reported that 17% of pressure vessels in water-phase process environments with hydrogen sulfide content less than 50 μg / g have also been found. cracking rate

Method used

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  • Alloy coating, processing method thereof and antiseptic spherical tank
  • Alloy coating, processing method thereof and antiseptic spherical tank
  • Alloy coating, processing method thereof and antiseptic spherical tank

Examples

Experimental program
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Effect test

Embodiment 1

[0089] The four in-service spherical tanks to be protected in this embodiment have a volume of 1000 cubic meters and an inner surface area of ​​484 square meters, three are liquefied petroleum gas fuel tanks, and one is a light hydrocarbon fuel tank. These four spherical tanks have been in service for more than 10 years, and the hydrogen sulfide content in the tank is very high, with an average concentration exceeding 5000 ppm. This situation has a very adverse effect on the safe operation of the spherical tank. In order to eliminate potential accidents, reduce hazards, and ensure the safe and stable long-term operation of liquid hydrocarbon spherical tanks, countermeasures must be taken to avoid equipment accidents.

[0090] (1) Sandblasting the inner wall of the spherical tank to achieve Sa3 see white level;

[0091] (2) Within 6 hours after the inner wall of the spherical tank is sandblasted, the alloy coating of the invention is sprayed by the arc spray method; the thickness of...

Embodiment 2

[0093] Example 2: Preparation before construction

[0094] (1) Quartz sand. 25 mesh corundum sand is firm, with edges and corners, no impurities, water content <1%, and it can be used after drying when it exceeds 1%.

[0095] (2) The alloy coated wire of the present invention and the special sealing agent for the alloy coating of the present invention.

Embodiment 3

[0096] Example 3: Surface pretreatment

[0097] (1) The rust removal method is sandblasting. Pressure feeding type sand feeding, sand blasting distance 200mm, sand blasting pressure 0.6MPa, sand blasting time 10s.

[0098] (2) Quality standards and testing methods: The surface treatment level meets the Sa3 level standard in GB8923 "Surface Derusting Grade Classification of Steel", that is, there is no visible grease, dirt, oxide scale, rust, paint coating and other attachments on the metal surface. The remaining traces should be only slight spots or streaks.

[0099] (3) The outlet of the air compressor must be equipped with an oil-water separator, and the outlet pressure is greater than 8kg / cm 2 ; After passing the sandblasting inspection, the first alloy layer needs to be sprayed within 6 hours.

[0100]

[0101]

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Abstract

The invention discloses an alloy coating, a processing method thereof and an antiseptic spherical tank. The alloy coating comprises zinc, aluminium, iron, manganese, carbon and rare earth element. The rare earth element is one or more of rhenium, lanthanum, cerium, praseodymium and indium. The zinc accounts for 83-86 parts by weight, the aluminium accounts for 14-16 parts by weight, the iron and manganese account for 0.000001-0.1 part by weight, the carbon accounts for 0.000001-0.03 part by weight, and the rare earth element accounts for 0.01-2.4 parts by weight. The rare earth element can be0.02-0.06 part of lanthanum and 0.03-0.08 part of cerium. In the invention, the characteristics that Zn, Al and other non-ferrous metals have good combinability with carbon steel, and isolation effect and cathode protection effect can be realized on the carbon steel substrate of a spherical tank. The zinc aluminium compound covering layer is characterized in that the respective advantages of zincand aluminium are maintained and the original disadvantages are overcome, so that the covering layer has the advantages of more excellent protective performance and longer service life.

Description

Technical field [0001] The invention relates to an anti-corrosion treatment material and its treatment method and anti-corrosion equipment, in particular to an alloy coating containing H2S spherical tank to prevent sulfide stress corrosion cracking, its treatment method and the treated anti-corrosion spherical tank. Background technique [0002] With the deep extraction of crude oil and the increase in the amount of imported crude oil, the sulfur content in the raw oil of the refinery is getting higher and higher, and for various reasons, many refineries are unable to dehydrate and desulfurize liquefied petroleum gas (LPG) in accordance with operating procedures. Treatment, the sulfur content in the LPG produced is also very high. At the same time, the sulfur content in the LPG produced in the oilfield has also risen sharply, and the corrosion of the LPG spherical tank has become increasingly serious. The total sulfur content in the LPG of a petrochemical company under PetroChin...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/14B65D88/04B65D90/04C23C4/131
Inventor 赵杨丁宝峰杜翠女赵明
Owner 北京赛诺迪管道安全技术有限公司
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